Latched charge pump for phase locked loop
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United States of America Patent
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-
Nov 28, 2000
Grant Date -
N/A
app pub date -
Feb 1, 1999
filing date -
Feb 1, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A charge pump of a phase comparator in a phase locked loop is provided a latched comparator to minimize the effect of 'dead band' during the time between charging and discharging the loop filter of the charge pump. A latch is inserted between the charging or discharging amplifier and a reset switch which turns on either the charging amplifier or the discharging amplifier. The latch speed up the change over of the charging and discharging action due to regenerative action. The latch can be an asymmetrical flip flop with one inverter fed from a reference current source and a second inverter fed from an on/off current source as controlled by the sourcing command from the phase comparator.
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